Age Calculator
Calculate your exact age in years, months, and days.
Completed years, months, and days from date of birth to an as-of date (today by default). It is not a days-between-dates tool and not a life-expectancy table.
Formula
Age is the civil-time difference: whole years, then leftover months, then leftover days, using calendar month lengths.
How to calculate
- Enter date of birth.
- Optionally enter a second date; otherwise the as-of date is today.
- Read years / months / days. Total days is a separate count.
Example
Born 15 March 2000, as of 15 March 2026, is exactly 26 years.
Common mistake
Leap days: a 29 February birthday in a common year is usually treated as 28 February or 1 March depending on local civil rules. This page uses the calendar difference, not a 365.25-year approximation.
FAQ
Can I calculate age from date of birth (DOB)?
Yes. Enter DOB and optionally a second date (today by default).
How many days old am I?
The page also counts the day span. That is not the same as years + months + days, because months vary in length.